[issue19610] Give clear error messages for invalid types used for setup.py params (e.g. tuple for classifiers)

[Neil Schemenauer]

Change by Neil Schemenauer <nas-python at arctrix.com>:


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pull_requests: +4598
stage: resolved -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19610>
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